Mailchimp Add E-Email Address CURL PHP

add Mailchimp email address by CURL

<?php 
// require 'auth.php';
$username = 'username';
$password = 'password';
$url = 'https://us19.api.mailchimp.com';
// $postvars = "[email protected]&status=subscribed";
$postvars = [
    "email_address"=> "[email protected]",
    "status"=> "subscribed",
    "merge_fields" => [
		"FNAME"=> "Aziz anawar",
		"DEPT" => "CSE",
		"PHONE" => "+9898797",
		"ROLE" =>"STUDENT"
    ]
];

$postvars = json_encode($postvars);

// var_dump($postvars);
// die();

$url = "https://us19.api.mailchimp.com/3.0/lists/listID/members/";
// $url = "http://localhost/temp/post.php";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, "$username:$password");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$postvars);

$result = curl_exec($ch);

curl_close($ch); 
echo($result);